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3 years ago

Variations to the forehand stroke are not allowed. a. true b. false

Physics

2 answers:

kozerog [31]3 years ago

8 0

Answer:

false

Explanation:

The forehand stroke is a basic shot in tennis, variations are allowed in order to boost performance (power, topspin and accuracy) of the player. Some guidelines to choose the correct forehand stroke are to visualize the correct stroke, position correctly, correct footwork and selecting shot location.

timofeeve [1]3 years ago

3 0

This is b. false

There are numerous ways of adjusting the forehand stroke and variations are allowed.

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nasty-shy [4]

Answer:

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Explanation:

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2 years ago

Find the kinetic energy of an electron whose de broglie wavelength is 34.0 nm.

dezoksy [38]

The De Broglie wavelength of the electron is
$\lambda=34.0 nm=34 \cdot 10^{-9} m$
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$p= \frac{h}{\lambda}= \frac{6.6 \cdot 10^{-34} Js}{34 \cdot 10^{-9} m}=1.94 \cdot 10^{-26} kg m/s$

Given $p=mv$ , with m being the electron mass and v its velocity, we can find the electron's velocity:
$v= \frac{p}{m}= \frac{1.94 \cdot 10^{-26} kgm/s}{9.1 \cdot 10^{-31} kg}= 2.13 \cdot 10^4 m/s$

This velocity is quite small compared to the speed of light, so the electron is non-relativistic and we can find its kinetic energy by using the non-relativistic formula:
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